Geochemistry, petrogenesis and tectonic setting of the Sarcheshmeh Eocene mafic lava flows, Southwest of Rafsanjan

The Eocene mafic lava flows of Sarcheshmehare cropped out in the southwest of Rafsanjan area at the central part of the Urmia – Dokhtar magmatic belt. The rocks are basalt, basaltic andesite and andesite in composition and consist of clinopyroxene plagioclase ± olivine ± hornblende phenocrysts. The geochemical characteristics show calc-alkaline nature for the lavas that are formed in an active continental margin tectonic environment. Low amounts of MgO, Cr and Ni in the Sarcheshmeh Eocene basaltic lavas points to the role of evolution in their parental magma. The MORB normalized multi-element patterns of the lava flows show enrichment in LILE (e.g. Sr, K, Rb and Ba) and depletion in HFSE (e.g. Ta, Nb and Ti). The Chondrite-normalized REE patterns show moderate enrichments in LREE with (La/Yb)n